Can you give some more details? You mean if someone has incorrectly filled out the form, you want the default validation text to move from the top to be seen at the bottom?
There are a few ways to accomplish this:
If these don't suit your needs I encourage you to search around on the forum!
I’m designing a Nintex form using Smart phone layout and I want the validation message to be shown below on the respective controls, instead on one on the top. Is that possible?